Abstract
During November, 1998, the first components of the international space station were launched. Future research on board will include the effect of microgravity on the human body. Data concerning hormonal regulation in man under micro-gravity conditions are scanty or absent. We measured erythropoietin, the predominant regulator of the red blood cell mass,1 transferrin receptors, thrombopoietin, and vascular endothelial growth factor, an important angiogenic factor,2 before, during, and after a 21-day spaceflight.
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